Bicyclists- and pedestrians bridge ‘Keizerspark’ Ingenieursbureau STENDESS N.V. Grote Baan 18 9920 Lovendegem Belgium Tel.: +32 9 370 71 25 Fax: +32 9 372 43 95 Contact: ir. Geert Goethals; ir. Jurn De Vleeschauwer Email: [email protected] Website: www.stendess.com A steel and concrete engineering company Stendess can vouch for the total stability analysis of projects. Our approach covers the initial study trough to the end project. With its in-house know-how in steel as well as concrete, the firm is able to offer full study pack-ages for both materials. Thanks to its accumulated know-how and its advanced infrastructure, Stendess can follow up on cross-border projects in accordance with most standards and codes: Eurocode, NBN, NEN, DIN, NF, AISC, British Stan-dards and specific national codes. Key activities • Industrial buildings: steel factories, power plants, depots, etc, • Other buildings: service buildings, concert halls, sport facilities, swimming pools, apartment buildings, • Bridge construction: all types of bridges • Off-shore projects: lock gates, Roro, oil rigs, … • Industrial equipment: silos, cranes, crane ways • Erection engineering: longitudinal and transverse repositioning, skidding, hoisting,… Type: cable stayed 3D-Truss bridge Location: Keizerspark, 900 Ghent, Belgium Owner: Ministerie van de Vlaamse Gemeenschap; Afdeling Bovenschelde; Administratie Waterwegen en Zeewezen Architect: Ministerie van de Vlaamse Gemeenschap; Afdeling Bovenschelde; Administratie Waterwegen en Zeewezen; Ir. Luc Hesters Engineering office: Ingenieursbureau STENDESS N.V., Lovendegem, Belgium Contractor: Metaalconstructie Aelterman B.V.B.A., Destelbergen, Belgium Total steel weight: ± 70 tonnes Total length: 50 m Highest point: ± 40 m (top of pylon) Building period: end 2003 - begin 2004 Short description of the project This project fits in the programme of “Herwaarderingsplan voor de Gentse binnenwateren en jaagpaden”. By building this bridge, they connected, the functional as well as the recreational bicycle- and pedestrians traffic between the city centre and the banks of the Scheldt. With its current design and its 40 m high and peak pylons, the bridge over the Scheldt is a beacon in the environment and it symbolizes the entrance for pedestrians and bicyclists to the city centre. The whole of three-dimensional pylons and cables, inclined in various directions, give together with the asymmetrical and parabolic design of the bridge deck, a dynamic character to the bridge. The very light structure of the bridge deck curves as a stretched parabolic arch above the water surface and gives an elegant appearance in the landscape. Use of ESA-Prima Win Description of technical questions solved with ESA-Prima Win The following technical problems occurred in the start of the project. At first there was the simulation of the realistic behaviour of the cables. Second there was the risk of instability of the pylons because they were not moment connected at the bottom and were stabilized by cables going to the bridge and cables to the ground resulting in a complex hyperstatic system in which several cables came under compression or axial force equal zero. Pre-tensioning of the cables was partly the solution, but because of the low weight of the bridge deck, uplifting of the bridge was possible. Finding the balance between weight and stiffness of the deck and cable-section together with pre-tensioning of the cables was one of the challenges in this project. Another challenge in this project was the theoretical aerodynamic study of the complete structure which was imposed by owner. This because of the light and slender character of the structure. Vibrations under live load and wind load were feared and had to be taken under control. Description of how our experience with ESA-Prima Win proved its completeness • Checking the structure as a combined 1D and 2D-elemented 3D-model with a high hyperstatic degree according EC3. • The possibility of doing a theoretical aerodynamic study by using the possibility of ESA-Prima Win to calculate the eigenvalues of the bridge deck and the pylons. More in detail calculating the eigenvalues of the bridge deck in accordance to horizontal, vertical and torsional stiffness to check for risk under wind load like galloping, classical and stall flutter, and calculating the eigenvalues of the pylons to check the risk for Von Karmion effect under wind loads. 82 Company Project Bicyclists- and pedestrians bridge ‘Keizerspark’ SCIA User Contest 2005 / Civil Engineering 2 Categorie
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